Since T-Mobile is being cagey (likely for regulatory reasons) about the locations of its re-farmed, iPhone-compatible HSPA+ network, a group at Airportal.de has filled us in. The 3G/4G locales are submitted by iPhone 3G and newer owners (or non-AWS 4G phone users) who are seeing 3G/4G on T-Mobile. T-Mobile claims its HSPA+ network shows speeds up to 70 percent higher than AT&T’s network.